part Part I. Spintronic Materials and Characterizations -- chapter 1 Magneto-Optical Studies of Magnetic Oxide Semiconductors -- chapter 2 Synthesis and Characterization of Wide Band-Gap Semiconductor Spintronic Materials -- chapter 3 Magnetic Properties of (Ga,Mn)As-Based Magnetic Semiconductors -- chapter 4 Soft X-Ray Resonant Magnetic Scattering from Magnetic Nanostructures -- chapter 5 The Effect of Ru on Magnetization Switching and CPP-GMR Enhancement -- chapter 6 The Spin-Dependent Interfacial Transparency -- part Part II. Spin Torque and Domain Wall Magneto Resistance -- chapter 7 Current-Driven Switching of Magnetization: Theory and Experiment -- chapter 8 Domain Wall Scattering and Current-Induced Switching in Ferromagnetic Wires-Experiment -- chapter 9 Domain Wall Magnetoresistance in Magnetic Nanowires-Theory -- chapter 10 Introduction to a Theory of Current-Driven Domain Wall Motion -- part Part III. Spin Injection and Spin Devices -- chapter 11 Silicon-Based Spin Electronic Devices:Toward a Spin Transistor -- chapter 12 Spin LEDs: Fundamentals and Applications -- chapter 13 Spin Photoelectronic Devices Based on Fe and the Heusler Alloy Co MnGa -- chapter 14 Electron Spin Filtering across a Ferromagnetic Metal/Semiconductor Interface Measured by Photoexcitation -- chapter 15 Ferromagnetic Metal/III-V Semiconductor Hybrid Spintronic Devices -- chapter 16 The Spin-Value Transistor*.